#content
  width 100%
  min-width _max-width
/*content container*/
.c-c
  position relative
  width _max-width
  margin 0 auto
/*全局提醒*/
#alert
  z-index 10001
  display inline-block
  color #ffffff
  background-color rgba(0,0,0,0.5)
  padding 20px 40px
  font-style normal
  position absolute
  left 50%
  top 50%
  width auto
  max-width  100%
  overflow hidden
  border-radius 5px
  font-size 0.9rem
  transform translate(-50%,-50%)